Light drawing: make 2 light sources interact with eachother

ga77

I'm new to processing and have been doing funprogramming.org light drawing tutorial (no. 150). Just wondering if it's possible to include a second light source, maybe a red and a white light, and have something happen when the 2 cross paths. Is this possible and how would I go about it? thanks in advance!

TfGuy44

Should be. Hard to know without seeing a running example.

ga77

import processing.video.*;

Capture cam;

void setup() {
    size(320, 240);
    frameRate(30);
    background(0);
    String[] cameras = Capture.list();          
    cam = new Capture(this, 320, 240, cameras[0]);    
    cam.start();
}

void captureEvent(Capture cam) 
{
  cam.read();
}

void draw()
{
  image(cam, 0, 0);                      
  cam.loadPixels();      
  loadPixels();
  for(int i = 0; i < cam.pixels.length; i++)                                  
    {
    if(brightness(cam.pixels[i]) > 230)            

      {
       cam.pixels[i] = color(255);                  // makes it white [had to specify cam.pixels]
      }
    }

    updatePixels();          
}

ga77

This is what I have so far, which isn't fully working either.. any help appreciated!

kfrajer

You don't need line 22. Line 29 should be pixels[i]=color(255);

Can you tell us what is a light source in your concept?

Kf

ga77

Thanks for the reply! I am thinking a small bright bike light or something similar, I'm getting it to pick up the brightest points (using phone light) now but I need to make the light 'draw' and for that to stay on screen

jeremydouglass

@ga77 -- once you are registering your traces, you might find this previous discussion useful for making your two traces interact:

- https://forum.processing.org/two/discussion/comment/114960/#Comment_114960

ga77

Thanks for all the help!